import requests

url = 'https://www.ems.com.cn/pc/login/index?_url=LyMv&from=emsnew'
headers = {
    'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36 Edg/91.0.864.67',
}
res = requests.get(url,headers=headers)
print(res.headers)